#include <iostream>
using namespace std;
int main() {
  int a, b;
  char c;
  cin >> a >> b >> c;
  switch (c) {
    case '+':
      cout << a + b << endl;
      break;
    case '-': 
      cout << a - b << endl;
      break;
    case '*':
      cout << a * b << endl;
      break;
    case '/':
      if (b == 0) cout << "Divided by zero!" << endl;
      else cout << a / b << endl;
      break;
    default:
      cout << "Invalid operator!" << endl;
  }
}